Will yellow glasses stop me being blinded ?
In the winter I commute along a canal path, the lights from the other cyclists are blinding at times.
Will yellow glasses stop this, it's too dark for normal sunglasses?
No. What blinds you is the relative brightness of the bike lights and the fact that unlike legal car lights, many of them are pointing straight at your face.
The yellow lenses are designed to increase contrast in daylight. They work by blocking blue light, which is scattered so that it comes from all directions and makes shadows less visible.
EDIT: The spectrum of most white LEDs does have an intense spike at blue wavelength. Most of the energy is still at longer wavelengths, where yellow glasses do not do much. They will also filter your own headlight and street lights if they are white LED variety. Because of Purkinje effect, the blue part of spectrum is more important for low light vision. This is why white LEDs seem disproportionately bright and why yellow glasses restrict your vision more in dark than during the day.
Some manufacturers of these kinds of glasses claim that their products can help reduce glares from other cars using LED headlights. I'm not sure how much blue light it filters out.
It's the blue rich LEDs that are more blinding. Some LEDs are better at preserving our night vision such as warm white, yellow, orange, and red. Warmer colours, blue blocking glasses would affect your's less since there's less blue light. More options for warm white LED headlights are online. You can also make one. The nice thing is that your own headlight's reflections would be less blinding so that you can see unlit areas better. This may give you more time to react when animals or people cross the road right in front of you especially when poorly lit.
If you're using yellow glasses, make sure that some blue light is allowed to pass through as you need to be able to see police car flashers. Also, regular blue blockers can reduce cyan light, making green traffic lights appear dimmer. Green traffic lights seem to use cyan LEDs.